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• W4312584518 abstract "Cache side channel attacks in the presence of shared memory have been used to extract cryptographic keys and enclave data, and are used by Spectre variants for leaking speculatively loaded data. Timing side channels exist in shared caches due to the difference in response latency of cached and uncached data. In prior work, we presented TimeCache, a cache design that prevents side channel exploits from reuse of shared memory. In this work, we extend TimeCache to also defend against attacks that exploit coherence states. TimeCache allows all running applications to use the entire cache, avoiding the need for partitioning in order to effect timing isolation. A per-process caching context prevents cache hits on data filled by another process. A novel bit-serial timestamp-parallel comparison logic allows low-overhead update of stale caching contexts. The defense is suited to all caches levels, and defends against an attacker running on any core. We evaluate TimeCache using the gem5 simulator to show that it is capable of preventing both reuse attacks and an attack based on coherence state leak. The average performance overhead for SPEC2006 is 1.13%, and for PARSEC and SPLASH is 0.46%." @default.
• W4312584518 created "2023-01-05" @default.
• W4312584518 creator A5013232946 @default.
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• W4312584518 date "2023-02-01" @default.
• W4312584518 modified "2023-10-18" @default.
• W4312584518 title "Preventing Coherence State Side Channel Leaks Using TimeCache" @default.
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• W4312584518 doi "https://doi.org/10.1109/tc.2022.3209922" @default.
• W4312584518 hasPublicationYear "2023" @default.
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